Watch-balance tester.



Patented July I7, I900. L. GBISEL. WATCH BALANCE TESTER.

A lication filed. June 12', 1899.)

(No Model.)

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NITED STATES ATEN'I FFIQE.

WATCH-BALANCE TESTER.

SPECIFICATION forming part of Letters Patent No. 653,996, dated July 17, 1900.

Application filed June 12, 1899.

To all whom it may concern:

Be it known that I, LUoIEN GRISEL, a citi zen of the Republic of Switzerland, and a resident of La GhauX-de-Fonds, canton of Neutchatel, Switzerland, have invented certain new and useful Improvements in Machines forTesting \Vatch-Balances, of which the following is a specification.

The testing-machines built and used until now have a balance-wheel worked by any suitable mechanism to the number of vibra= tions wanted, above which the balance-wheel of the watch to be tested was made to oscillate, said balance-wheel being hung by its hair-sprin g to a suitable potence. That system, besides other inconveniences, had this very serious one that the way of suspension and pivoting of the hair-spring and balancewheel not being the same when those parts were placed on the regulating-machine or in the movement it resulted very often in noticeable mistakes. That system, besides, required very great skill and close attention from the worker. The machine I have invented permits the testing of the balancewheel and its hair-spring placed definitively on the cock of the movement, the difference in the vibrations being, besides, rendered more visible by means of hands indicating the fifths of a second, the seconds, and the minutes.

Figure I is a plan view of the testing-machine, and Fig. II a side elevation of it, showing on the machine the place where the cock bearing the balance-wheel to be regulated is placed. Fig. III is a bottom view of the parts shown in Fig. II.

Two similar barrels B B communicate each their motion, by the medium of the wheels and pinions b b A A a a O O c c L L e e, to the escape-wheels E E, against which the lever-forks F F are acting, a balance-wheel, G acting on the fork F. The balance-wheel, as well as the escapement it is working, is so calculated as to give a determined number of vibrations, corresponding to the number of the balance-wheels vibrations of the watch to be tested. The arbors of the pinions Z) and I) bear each a hand showing the number of minutes on the dials N N, respectively. The arbors of the pinions c c are provided each with a hand S S, showing the seconds, and

Serial No. 720,256. (No model.)

head-screw h, screwed into a second sliding block D, that may be moved into a slide J by a pinion k, acting upon a rack K, attached to the sliding block D, that pinion being worked by the knob M. The screw h is provided with a hole-jewel o, the hole of which corre-- 'sponds to the pivot of the balance-wheel arbor to be tested. In the arm P a cylindrio spindle p may be moved, opposite which is another spindle p, the threaded end of which is provided with a nut-screw y, allowing to push down more or less that spindle, which is pushed up again by a spring r. A spring it acts also between the head U of the screw it and the piece II, so as to insure the contact of that piece with the sliding block D, while giving a certain elasticity to that coupling arrangement.

To test a balance, the cock, with the balance-wheel on its arbor and the hair-spring,

is placed'between the two spindles 1919, which are regulated so as to obtain the suitable height insuring the desired contact of the balance wheel roller with the fork of the lever F, the distance from the centers being obtained in movingin one direction orthe other the sliding block d,bearing the potence,by the screw V, and the sliding block I) by the knob M, that sliding block bearing the screw h, of which the hole-jewel 0 constitutes the lowest point of the balance-Wheel arbor pivoting, the upper pivot pivoting naturallyin its place in the cock. The balance-wheel being then in place and taken by the escapement and the two barrels wound up, the two balancewheels are placed. so that the seconds, minutes, and fifths-of-seconds hands are occupying the same position, thenthey are let start together between the two balance-wheels, the differences of vibrations being read on the tween the two balance-wheels until they viblock, an arm P having a clamp for holding brate in unison. the balance-bridge and balance to be tested,

Having thus described my invention, I and a sliding connection between said arm 15 5 claiin as new and desire to secure by Letters and piece 11, substantially as described.

dials what allows to correct the distances be- I train, a piece H pivotally connected with said Patent In witness whereof I have hereunto set my In a watch-balance-testing device having a hand in presence of two witnesses. frame or support carrying two trains of gear- LUGIEN GRISEL. ing and a testing-balance operated by'one of Witnesses: 10 said gearing, a block D having a sliding 0011- PAUL MEROZ,

nection with said frame adjacent to the other CHARLES KOHLER. 

